[I repeated Day 7 below! So this is 13, not 12. :)]
The work of the Holy Ghost began on the day of Pentecost, when he descended visibly to the Apostles and disciples. It is in this dispensation we live, and when He reigns on earth, the work of the Holy Spirit will be finished. When is realized the petition of the Saviour, "Thy will be done on earth as it is in heaven."
Through the Holy Spirit the world was called out of chaos.
Through Him the patriarchs and prophets were inspired.
Through Him the way to the Incarnation was prepared.
Through Him the Church was established.
Through Him every Christian soul is regenerated.
Through Him all things receive their perfection and are glorified.
Through the Holy Spirit the martyrs received the strength to sustain triumphantly their sufferings.
Through Him the apostles of nations were filled with zeal and the power to convert nations.
Through the Holy Spirit we receive all that is Holy, Good, True and Beautiful.
Sanctity is the result of the primary or immediate action of the Holy Spirit in the individual soul and its faithful correspondence with this inspiration.